In order to reduce the maintenance work of QMP.
Given that the focus of this patchset is huge VM migration, is
it possible to enable or disable these two features with a single
parameter, such as "cpu-aggressive-throttle"?
Yong
On Mon, Sep 9, 2024 at 10:26 PM Hyman Huang <yong.hu...@smartx.com> wrote:
> To enable the responsive throttle that will be implemented
> in the next commit, introduce the cpu-responsive-throttle
> parameter.
>
> Signed-off-by: Hyman Huang <yong.hu...@smartx.com>
> ---
> migration/migration-hmp-cmds.c | 8 ++++++++
> migration/options.c | 20 ++++++++++++++++++++
> migration/options.h | 1 +
> qapi/migration.json | 16 +++++++++++++++-
> 4 files changed, 44 insertions(+), 1 deletion(-)
>
> diff --git a/migration/migration-hmp-cmds.c
> b/migration/migration-hmp-cmds.c
> index f7b8e06bb4..a3d4d3f62f 100644
> --- a/migration/migration-hmp-cmds.c
> +++ b/migration/migration-hmp-cmds.c
> @@ -273,6 +273,10 @@ void hmp_info_migrate_parameters(Monitor *mon, const
> QDict *qdict)
> MigrationParameter_str(
> MIGRATION_PARAMETER_CPU_PERIODIC_THROTTLE_INTERVAL),
> params->cpu_periodic_throttle_interval);
> + assert(params->has_cpu_responsive_throttle);
> + monitor_printf(mon, "%s: %s\n",
> +
> MigrationParameter_str(MIGRATION_PARAMETER_CPU_RESPONSIVE_THROTTLE),
> + params->cpu_responsive_throttle ? "on" : "off");
> assert(params->has_max_cpu_throttle);
> monitor_printf(mon, "%s: %u\n",
> MigrationParameter_str(MIGRATION_PARAMETER_MAX_CPU_THROTTLE),
> @@ -529,6 +533,10 @@ void hmp_migrate_set_parameter(Monitor *mon, const
> QDict *qdict)
> p->has_cpu_periodic_throttle_interval = true;
> visit_type_uint8(v, param, &p->cpu_periodic_throttle_interval,
> &err);
> break;
> + case MIGRATION_PARAMETER_CPU_RESPONSIVE_THROTTLE:
> + p->has_cpu_responsive_throttle = true;
> + visit_type_bool(v, param, &p->cpu_responsive_throttle, &err);
> + break;
> case MIGRATION_PARAMETER_MAX_CPU_THROTTLE:
> p->has_max_cpu_throttle = true;
> visit_type_uint8(v, param, &p->max_cpu_throttle, &err);
> diff --git a/migration/options.c b/migration/options.c
> index 2dbe275ba0..aa233684ee 100644
> --- a/migration/options.c
> +++ b/migration/options.c
> @@ -110,6 +110,8 @@ Property migration_properties[] = {
> DEFINE_PROP_UINT8("x-cpu-periodic-throttle-interval", MigrationState,
> parameters.cpu_periodic_throttle_interval,
> DEFAULT_MIGRATE_CPU_PERIODIC_THROTTLE_INTERVAL),
> + DEFINE_PROP_BOOL("x-cpu-responsive-throttle", MigrationState,
> + parameters.cpu_responsive_throttle, false),
> DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState,
> parameters.max_bandwidth, MAX_THROTTLE),
> DEFINE_PROP_SIZE("avail-switchover-bandwidth", MigrationState,
> @@ -715,6 +717,13 @@ bool migrate_periodic_throttle(void)
> return s->parameters.cpu_periodic_throttle;
> }
>
> +bool migrate_responsive_throttle(void)
> +{
> + MigrationState *s = migrate_get_current();
> +
> + return s->parameters.cpu_responsive_throttle;
> +}
> +
> bool migrate_cpu_throttle_tailslow(void)
> {
> MigrationState *s = migrate_get_current();
> @@ -899,6 +908,8 @@ MigrationParameters
> *qmp_query_migrate_parameters(Error **errp)
> params->has_cpu_periodic_throttle_interval = true;
> params->cpu_periodic_throttle_interval =
> s->parameters.cpu_periodic_throttle_interval;
> + params->has_cpu_responsive_throttle = true;
> + params->cpu_responsive_throttle =
> s->parameters.cpu_responsive_throttle;
> params->tls_creds = g_strdup(s->parameters.tls_creds);
> params->tls_hostname = g_strdup(s->parameters.tls_hostname);
> params->tls_authz = g_strdup(s->parameters.tls_authz ?
> @@ -967,6 +978,7 @@ void migrate_params_init(MigrationParameters *params)
> params->has_cpu_throttle_tailslow = true;
> params->has_cpu_periodic_throttle = true;
> params->has_cpu_periodic_throttle_interval = true;
> + params->has_cpu_responsive_throttle = true;
> params->has_max_bandwidth = true;
> params->has_downtime_limit = true;
> params->has_x_checkpoint_delay = true;
> @@ -1208,6 +1220,10 @@ static void
> migrate_params_test_apply(MigrateSetParameters *params,
> params->cpu_periodic_throttle_interval;
> }
>
> + if (params->has_cpu_responsive_throttle) {
> + dest->cpu_responsive_throttle = params->cpu_responsive_throttle;
> + }
> +
> if (params->tls_creds) {
> assert(params->tls_creds->type == QTYPE_QSTRING);
> dest->tls_creds = params->tls_creds->u.s;
> @@ -1325,6 +1341,10 @@ static void
> migrate_params_apply(MigrateSetParameters *params, Error **errp)
> params->cpu_periodic_throttle_interval;
> }
>
> + if (params->has_cpu_responsive_throttle) {
> + s->parameters.cpu_responsive_throttle =
> params->cpu_responsive_throttle;
> + }
> +
> if (params->tls_creds) {
> g_free(s->parameters.tls_creds);
> assert(params->tls_creds->type == QTYPE_QSTRING);
> diff --git a/migration/options.h b/migration/options.h
> index efeac01470..613d675003 100644
> --- a/migration/options.h
> +++ b/migration/options.h
> @@ -70,6 +70,7 @@ uint8_t migrate_cpu_throttle_increment(void);
> uint8_t migrate_cpu_throttle_initial(void);
> uint8_t migrate_periodic_throttle_interval(void);
> bool migrate_periodic_throttle(void);
> +bool migrate_responsive_throttle(void);
> bool migrate_cpu_throttle_tailslow(void);
> bool migrate_direct_io(void);
> uint64_t migrate_downtime_limit(void);
> diff --git a/qapi/migration.json b/qapi/migration.json
> index 6d8358c202..9f52ed1899 100644
> --- a/qapi/migration.json
> +++ b/qapi/migration.json
> @@ -734,6 +734,10 @@
> # @cpu-periodic-throttle-interval: Interval of the periodic CPU
> throttling.
> # (Since 9.1)
> #
> +# @cpu-responsive-throttle: Make CPU throttling more responsively by
> +# introduce an extra detection metric of
> +# migration convergence. (Since 9.1)
> +#
> # @tls-creds: ID of the 'tls-creds' object that provides credentials
> # for establishing a TLS connection over the migration data
> # channel. On the outgoing side of the migration, the credentials
> @@ -855,7 +859,7 @@
> 'throttle-trigger-threshold',
> 'cpu-throttle-initial', 'cpu-throttle-increment',
> 'cpu-throttle-tailslow', 'cpu-periodic-throttle',
> - 'cpu-periodic-throttle-interval',
> + 'cpu-periodic-throttle-interval', 'cpu-responsive-throttle',
> 'tls-creds', 'tls-hostname', 'tls-authz', 'max-bandwidth',
> 'avail-switchover-bandwidth', 'downtime-limit',
> { 'name': 'x-checkpoint-delay', 'features': [ 'unstable' ] },
> @@ -916,6 +920,10 @@
> # @cpu-periodic-throttle-interval: Interval of the periodic CPU
> throttling.
> # (Since 9.1)
> #
> +# @cpu-responsive-throttle: Make CPU throttling more responsively by
> +# introduce an extra detection metric of
> +# migration convergence. (Since 9.1)
> +#
> # @tls-creds: ID of the 'tls-creds' object that provides credentials
> # for establishing a TLS connection over the migration data
> # channel. On the outgoing side of the migration, the credentials
> @@ -1045,6 +1053,7 @@
> '*cpu-throttle-tailslow': 'bool',
> '*cpu-periodic-throttle': 'bool',
> '*cpu-periodic-throttle-interval': 'uint8',
> + '*cpu-responsive-throttle': 'bool',
> '*tls-creds': 'StrOrNull',
> '*tls-hostname': 'StrOrNull',
> '*tls-authz': 'StrOrNull',
> @@ -1132,6 +1141,10 @@
> # @cpu-periodic-throttle-interval: Interval of the periodic CPU
> throttling.
> # (Since 9.1)
> #
> +# @cpu-responsive-throttle: Make CPU throttling more responsively by
> +# introduce an extra detection metric of
> +# migration convergence. (Since 9.1)
> +#
> # @tls-creds: ID of the 'tls-creds' object that provides credentials
> # for establishing a TLS connection over the migration data
> # channel. On the outgoing side of the migration, the credentials
> @@ -1254,6 +1267,7 @@
> '*cpu-throttle-tailslow': 'bool',
> '*cpu-periodic-throttle': 'bool',
> '*cpu-periodic-throttle-interval': 'uint8',
> + '*cpu-responsive-throttle': 'bool',
> '*tls-creds': 'str',
> '*tls-hostname': 'str',
> '*tls-authz': 'str',
> --
> 2.39.1
>
>
--
Best regards
